From 700 B.C., the Celts came from the__ and began to inhabit British Isles（）
A. Iberian Peninsula
B. Lower Rhineland
C. Scandinavian countries
D. Upper Rhineland
The teacher entered the classroom,_by a group of children（）
A. having followed
B. following
C. having been followed
D. followed
Great Britain is on its way to withdraw from__（）
A. the North Atlantic Treaty Organization
B. the United Nations Security Council
C. the European Union
D. the Group of Seven
_a girl had fallen into the river, he took off his coat and jumped into the water（）
A. Having found
B. Having been found
C. Finding
D. Found
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